OK, I'm going to take my stab at it: I think you should not use the tabs at all. They lower pH, and yours is low, and they raise CYA, and yours is a bit high. Stick with regular unscented bleach. 1 gallon of 6% raises 10,000 gallons of water 6ppm of FC, so figure accordingly. Save them for next year when CYA is low.

With both a low Alk and pH, another alternative is Arm&Hammer Washing Soda, in the yellow box. It will raise both and at $.80/lb, is far cheaper than the pool stores sell it for, though it's the same stuff (sodium carbonate) as their "pH Up!" and similar products.

But baking soda and Borax will work just as well.

Carl